Malicious PDF — malware analysis report

Static analysis result for SHA-256 137772b676a82af0…

MALICIOUS

PDF

460.3 KB Created: 2021-06-25 22:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b5423cf0d89501ad8aaf8eb1a492e17 SHA-1: 1a48f8e5d3e52bc5ede43d1f352d1a26a93cfc1b SHA-256: 137772b676a82af01b68b5526a3a7af427304231774860bd35fb2f5af50ca0dd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a link farm and an SEO redirector pointing to a compromised WordPress site, likely intended to lure users into downloading further malicious content. No scripts were extracted, but the presence of multiple compromised upload links suggests a distribution mechanism for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7549

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d780b3b9f3191a9e0394847ee45b5bce/62508507280.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c39233d05309c69e723758b315e08550/72491777525.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c4b771c71fead29edffba7bf963e6a67/losurivawiguker.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jukf2uc016lbsairovai61a8t3/zobum.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafcdaaae9---86873673486.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf7c6b669f---vuzuminugodabax.pdfIn PDF document text
    • http://markone-tools.com/upload/files/wulitidit.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/95aaaf8b585373ea704bde6841cbee95/loxeloxovagutewatizovi.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/gotilibimigok.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821af16beb2---merilazujofesil.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58270135407.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/debtq1r3qtsglugeucu8lfieh6/56360071810.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/14177623968.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/silazofuxakedagegarurex.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/wewuwikaken.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446e1c414---96096388191.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070c84d40eb4---64128273865.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/15076201822.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e13a5d31---puxotugiwepekugiwo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/387442631e38600a3b6d35e921814e0c/zapivuf.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a8a2768c---nitokasanaf.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/6004232092.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/pobujaritanoruxo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uup70k1gut2cfcpq8sluia035l/rimuziga.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9cd5436dc3c3e28951b79ed990210927/jezuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=blonde+hair+with+yellow+highlightsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0006c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1CE 10780 bytes
SHA-256: 83c1edb00a30b128dd403cacc0f1113461d3c6871498283469bbf3a48baff2b4
font_01_sfnt_off0006da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6E 17400 bytes
SHA-256: 72df566e030d6bae42b6180c652d2c0cfed54397eeebe3762342323513769bbd
font_02_sfnt_off000707ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1